The V versus T graph according to Charles' law is a straight line.

False

Explanation:

Among copper, invar, and iron, invar has the lowest linear expansion coefficient, not iron. Invar is a special alloy designed to have very low thermal expansion.

OR

The unit of the volume expansion coefficient is per kelvin (K⁻¹).

The pole of a spherical mirror is the geometric centre of the mirror's reflecting surface.

One use of X-rays is in medical imaging to diagnose fractures of bones.

A motor is a machine where electrical energy is converted into mechanical energy.

Neutral wire and the earth (or ground) wire.

Nuclear Fission is the kind of nuclear reaction that produces energy in a nuclear reactor.

OR

A natural radioactive element is Uranium-238 (U - 238).

2.11.1. A transuranic element - (b) Neptunium

2.11.2. A noble element - (a) Krypton

2.11.3. Prepared by carbon reduction of the oxide of the metal - (d) Zinc

2.11.4. In the alloy brass, the metal whose percentage amount is higher than that of the other metal - (c) Copper

Chloroform is not soluble in water. Sodium chloride (table salt) is highly soluble in water.

A metal that is extracted by the process of electrolysis is sodium.

OR

The anode in the electroplating of silver on a brass spoon is the silver electrode.

The energy that causes chemical reactions during electrolysis is electrical energy.

When you add red litmus paper to an aqueous solution of ammonia, it turns blue, indicating that the solution is alkaline in nature.

OR

NaOH + H₂S → Na₂S + H₂O